Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, down.
A177524
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =715a(7) =4970a(8) =39480a(9) =352800a(10) =3502800a(11) =38255900a(12) =455795100a(13) =5883052500a(14) =81774966000
External references
- oeis: A177524